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8. Construction equipment should be equipped with a vertical exhaust at least 5 <br /> feet above grade and/or with spark arrestors. <br /> 9. Electrical motors, if used in the excavation area, shall be explosion-proof or <br /> non-sparking, totally enclosed fan cooled (TEFC); and electrical controls should <br /> be explosion-proof or intrinsically safe and meet the requirements for Class 1, <br /> Division 2, Group D, (Methane), rated equipment in accordance with the <br /> National Electric Code (NEC)_ <br /> 10. No welding should be permitted in, on, or immediately near the excavation <br /> area, unless previously and continuously monitored for methane and other <br /> combustible gases. <br /> 11 . Soil should be stockpiled near the excavation or well for use*in smothering <br /> any combustion, should it occur. <br /> 12. Solvent cleaning, gluing, or bonding of pipe should be performed, to the <br /> extent possible, outside the trench. An organic vapor respirator shall be <br /> worn by persons using PVC solvents or glues. Personnel using solvent and <br /> cement shall be familiar with the appropriate materials safety data sheets <br /> for those products. <br /> 13. Forced ventilation may be required for workers who must work in trenches <br /> deeper than 3 feet. Air blowers and fans may be used for positive <br /> ventilation_ Dilution ventilation may address either an explosive gas hazard <br /> or a hazardous chemical health hazard. The amount of air required for <br /> ventilation must be determined based on the concentrations of explosive <br /> LFG or hazardous chemical constituents, the LEL for methane or the TLVs <br /> for the hazardous chemical constituents in question, the volume to be <br /> protected, ambient conditions, and an appropriate safety factor. These <br /> calculations should be performed by a qualified individual. <br /> 14. During piping assembly, all valves should be closed immediately after in- <br /> stallation. <br /> 15. As construction progresses, all valves should be closed as installed to <br /> prevent the migration of gases through the pipeline and gas collection <br /> system. <br /> 16. All piping shall be capped at the end of each working day. <br /> 1:20 <br />